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frontend.c
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frontend.c
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/* frontend.c: definitions of the dbus and scm-enhanced dbus
* frontend routines.
*
* Copyright © 2013 Stephane Graber
* Author: Stephane Graber <[email protected]>
* Copyright © 2014 Canonical Group Limited
* Author: Serge Hallyn <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define __frontend_c
#include <frontend.h>
int daemonise = FALSE;
int sigstop = FALSE;
bool setns_pid_supported = false;
unsigned long mypidns;
bool setns_user_supported = false;
unsigned long myuserns;
bool sane_cgroup(const char *cgroup)
{
if (!cgroup)
return false;
if (strstr(cgroup, ".."))
return false;
return true;
}
/* This function is done at the start of every Scm-enhanced transaction */
static struct scm_sock_data *alloc_scm_sock_data(NihDBusMessage *message,
int fd, enum req_type t)
{
struct scm_sock_data *d;
int optval = 1, dbusfd;
socklen_t len;
if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &optval, sizeof(optval)) == -1) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed to set passcred: %s", strerror(errno));
return NULL;
}
d = NIH_MUST( nih_alloc(NULL, sizeof(*d)) );
memset(d, 0, sizeof(*d));
d->fd = fd;
d->type = t;
if (!dbus_connection_get_socket(message->connection, &dbusfd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return NULL;
}
/* Read the proxy's credentials from dbus fd */
len = sizeof(struct ucred);
if (getsockopt(dbusfd, SOL_SOCKET, SO_PEERCRED, &d->pcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return NULL;
}
return d;
}
/*
* All Scm-enhanced transactions take at least one SCM cred,
* the requestor's. Some require a second SCM cred to identify
* a pid or uid/gid:
*/
static bool need_two_creds(enum req_type t)
{
switch (t) {
case REQ_TYPE_GET_PID:
case REQ_TYPE_GET_PID_ABS:
case REQ_TYPE_MOVE_PID:
case REQ_TYPE_MOVE_PID_ABS:
case REQ_TYPE_CHOWN:
return true;
default:
return false;
}
}
static void scm_sock_error_handler (void *data, NihIo *io)
{
struct scm_sock_data *d = data;
NihError *error = nih_error_get ();
nih_free(error);
d->fd = -1;
}
static void scm_sock_close (struct scm_sock_data *data, NihIo *io)
{
nih_assert (data);
nih_assert (io);
nih_free (io);
// Only delete data struct after io, because freeing io may call methods
// like error_handler that use this data struct.
if (data->fd != -1)
close (data->fd);
nih_free (data);
}
/*
* Write a char over the socket to tell the client we're ready for
* the next SCM credential.
*/
static bool kick_fd_client(int fd)
{
char buf = '1';
if (write(fd, &buf, 1) != 1) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed to start write on scm fd: %s", strerror(errno));
return false;
}
return true;
}
/*
* Called when an scm credential has been received. If this was
* the first of two expected creds, then kick the client again
* and wait (async) for the next credential. Otherwise, call
* the appropriate completion function to finish the transaction.
*/
static void sock_scm_reader(struct scm_sock_data *data,
NihIo *io, const char *buf, size_t len)
{
struct ucred ucred;
if (!get_nih_io_creds(data, io, &ucred)) {
nih_error("failed to read ucred");
nih_io_shutdown(io);
return;
}
if (data->step == 0) {
memcpy(&data->rcred, &ucred, sizeof(struct ucred));
if (need_two_creds(data->type)) {
data->step = 1;
if (!kick_fd_client(data->fd))
nih_io_shutdown(io);
return;
}
} else
memcpy(&data->vcred, &ucred, sizeof(struct ucred));
switch (data->type) {
case REQ_TYPE_GET_PID: get_pid_scm_complete(data); break;
case REQ_TYPE_GET_PID_ABS: get_pid_abs_scm_complete(data); break;
case REQ_TYPE_MOVE_PID: move_pid_scm_complete(data); break;
case REQ_TYPE_MOVE_PID_ABS: move_pid_abs_scm_complete(data); break;
case REQ_TYPE_CREATE: create_scm_complete(data); break;
case REQ_TYPE_CHOWN: chown_scm_complete(data); break;
case REQ_TYPE_CHMOD: chmod_scm_complete(data); break;
case REQ_TYPE_GET_VALUE: get_value_complete(data); break;
case REQ_TYPE_SET_VALUE: set_value_complete(data); break;
case REQ_TYPE_REMOVE: remove_scm_complete(data); break;
case REQ_TYPE_GET_TASKS: get_tasks_scm_complete(data); break;
case REQ_TYPE_LIST_CHILDREN: list_children_scm_complete(data); break;
case REQ_TYPE_REMOVE_ON_EMPTY: remove_on_empty_scm_complete(data); break;
case REQ_TYPE_PRUNE: prune_scm_complete(data); break;
case REQ_TYPE_GET_TASKS_RECURSIVE: get_tasks_recursive_scm_complete(data); break;
case REQ_TYPE_LISTKEYS: list_keys_scm_complete(data); break;
default:
nih_fatal("%s: bad req_type %d", __func__, data->type);
exit(1);
}
nih_io_shutdown(io);
}
int cgmanager_ping (void *data, NihDBusMessage *message, int junk)
{
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
return 0;
}
void get_pid_scm_complete(struct scm_sock_data *data)
{
// output will be nih_alloced with data as parent, and therefore
// freed when data is freed.
char *output = NULL;
int ret;
ret = get_pid_cgroup_main(data, data->controller, data->pcred,
data->rcred, data->vcred, &output);
if (ret == 0)
ret = write(data->fd, output, strlen(output)+1);
else
// Let the client know it failed
ret = write(data->fd, &data->rcred, 0);
if (ret < 0)
nih_error("GetPidCgroupScm: Error writing final result to client: %s",
strerror(errno));
}
/*
* This is one of the dbus callbacks.
* Caller requests the cgroup of @pid in a given @controller
*/
int cgmanager_get_pid_cgroup_scm (void *data, NihDBusMessage *message,
char *controller, int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_GET_PID);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
/* GetPidCgroup */
/*
* This is one of the dbus callbacks.
* Caller requests the cgroup of @pid in a given @controller
*/
int cgmanager_get_pid_cgroup (void *data, NihDBusMessage *message,
char *controller, int plain_pid, char **output)
{
int fd = 0, ret;
struct ucred rcred, vcred;
socklen_t len;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("GetPidCgroup: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
/*
* getpidcgroup results cannot make sense as the pid is not
* translated. Note that on an old enough kernel we cannot detect
* this situation. In that case we allow it - it will confuse the
* caller, but cause no harm
*/
if (!is_same_pidns(rcred.pid)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"GetPidCgroup called from non-init namespace");
return -1;
}
vcred.uid = 0;
vcred.gid = 0;
vcred.pid = plain_pid;
ret = get_pid_cgroup_main(message, controller, rcred, rcred, vcred, output);
if (ret) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
return -1;
}
return 0;
}
void get_pid_abs_scm_complete(struct scm_sock_data *data)
{
// output will be nih_alloced with data as parent, and therefore
// freed when data is freed.
char *output = NULL;
int ret;
ret = get_pid_cgroup_abs_main(data, data->controller, data->pcred,
data->rcred, data->vcred, &output);
if (ret == 0)
ret = write(data->fd, output, strlen(output)+1);
else
// Let the client know it failed
ret = write(data->fd, &data->rcred, 0);
if (ret < 0)
nih_error("GetPidCgroupAbsScm: Error writing final result to client: %s",
strerror(errno));
}
/*
* This is one of the dbus callbacks.
* Caller requests the cgroup of @pid in a given @controller, relative
* to the proxy's
*/
int cgmanager_get_pid_cgroup_abs_scm (void *data, NihDBusMessage *message,
char *controller, int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_GET_PID_ABS);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
/* GetPidCgroup */
/*
* This is one of the dbus callbacks.
* Caller requests the cgroup of @pid in a given @controller relative
* to the proxy's
*/
int cgmanager_get_pid_cgroup_abs (void *data, NihDBusMessage *message,
char *controller, int plain_pid, char **output)
{
int fd = 0, ret;
struct ucred rcred, vcred;
socklen_t len;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("GetPidCgroupAbs: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
/*
* getpidcgroup results cannot make sense as the pid is not
* translated. Note that on an old enough kernel we cannot detect
* this situation. In that case we allow it - it will confuse the
* caller, but cause no harm
*/
if (!is_same_pidns(rcred.pid)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"GetPidCgroupAbs called from non-init namespace");
return -1;
}
vcred.uid = 0;
vcred.gid = 0;
vcred.pid = plain_pid;
#ifdef CGMANAGER
/*
* A plain dbus request to escape cgroup root was made by a root
* owned task in cgmanager's namespace. We will send ourselves as the
* proxy.
*/
struct ucred mycred = {
.pid = getpid(),
.uid = getuid(),
.gid = getgid()
};
#else
/*
* This is the !CGMANAGER case. We are in the proxy. We don't
* support chained proxying anyway, so it is simple - the requestor
* is the proxy at this point; then we will proxy the call on to
* the cgmanager
*/
#define mycred rcred
#endif
ret = get_pid_cgroup_abs_main(message, controller, mycred, rcred, vcred, output);
if (ret) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
return -1;
}
return 0;
}
void move_pid_scm_complete(struct scm_sock_data *data)
{
char b = '0';
if (move_pid_main(data->controller, data->cgroup, data->pcred,
data->rcred, data->vcred) == 0)
b = '1';
if (write(data->fd, &b, 1) < 0)
nih_error("MovePidScm: Error writing final result to client");
}
int cgmanager_move_pid_scm (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup,
int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_MOVE_PID);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
d->cgroup = NIH_MUST( nih_strdup(d, cgroup) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
/*
* This is one of the dbus callbacks.
* Caller requests moving a @pid to a particular cgroup identified
* by the name (@cgroup) and controller type (@controller).
*/
int cgmanager_move_pid (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup, int plain_pid)
{
int fd = 0, ret;
struct ucred rcred, vcred;
socklen_t len;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("MovePid: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
/* If task is in a different namespace, require a proxy */
if (!is_same_pidns(rcred.pid)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Escape request from different namespace requires a proxy");
return -1;
}
vcred.uid = 0;
vcred.gid = 0;
vcred.pid = plain_pid;
ret = move_pid_main(controller, cgroup, rcred, rcred, vcred);
if (ret)
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
return ret;
}
void move_pid_abs_scm_complete(struct scm_sock_data *data)
{
char b = '0';
if (move_pid_abs_main(data->controller, data->cgroup, data->pcred,
data->rcred, data->vcred) == 0)
b = '1';
if (write(data->fd, &b, 1) < 0)
nih_error("MovePidScm: Error writing final result to client");
}
int cgmanager_move_pid_abs_scm (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup,
int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_MOVE_PID_ABS);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
d->cgroup = NIH_MUST( nih_strdup(d, cgroup) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
int cgmanager_move_pid_abs (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup, int plain_pid)
{
int fd = 0, ret;
struct ucred rcred, vcred;
socklen_t len;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("MovePid: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
vcred.uid = 0;
vcred.gid = 0;
vcred.pid = plain_pid;
#ifdef CGMANAGER
/*
* On an older kernel, require a proxy
*/
if (!setns_pid_supported) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"A proxy is required");
return -1;
}
#endif
/* If task is in a different namespace, require a proxy */
if (!is_same_pidns(rcred.pid)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Escape request from different namespace requires a proxy");
return -1;
}
#ifdef CGMANAGER
/*
* A plain dbus request to escape cgroup root was made by a root
* owned task in cgmanager's namespace. We will send ourselves as the
* proxy.
*/
struct ucred mycred = {
.pid = getpid(),
.uid = getuid(),
.gid = getgid()
};
#else
/*
* This is the !CGMANAGER case. We are in the proxy. We don't
* support chained proxying anyway, so it is simple - the requestor
* is the proxy at this point; then we will proxy the call on to
* the cgmanager
*/
#define mycred rcred
#endif
ret = move_pid_abs_main(controller, cgroup, mycred, rcred, vcred);
if (ret)
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
return ret;
}
void create_scm_complete(struct scm_sock_data *data)
{
char b = '0';
int32_t existed;
if (create_main(data->controller, data->cgroup, data->pcred,
data->rcred, &existed) == 0)
b = existed == 1 ? '2' : '1';
if (write(data->fd, &b, 1) < 0)
nih_error("createScm: Error writing final result to client");
}
int cgmanager_create_scm (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup, int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_CREATE);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
d->cgroup = NIH_MUST( nih_strdup(d, cgroup) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
/*
* This is one of the dbus callbacks.
* Caller requests creating a new @cgroup name of type @controller.
* @name is taken to be relative to the caller's cgroup and may not
* start with / or .. .
*/
int cgmanager_create (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup, int32_t *existed)
{
int fd = 0, ret;
struct ucred rcred;
socklen_t len;
*existed = -1;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("Create: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
ret = create_main(controller, cgroup, rcred, rcred, existed);
if (ret)
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
nih_info(_("%s: returning %d; existed is %d"), __func__, ret, *existed);
return ret;
}
void chown_scm_complete(struct scm_sock_data *data)
{
char b = '0';
if (chown_main(data->controller, data->cgroup, data->pcred,
data->rcred, data->vcred) == 0)
b = '1';
if (write(data->fd, &b, 1) < 0)
nih_error("ChownScm: Error writing final result to client");
}
int cgmanager_chown_scm (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup, int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_CHOWN);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
d->cgroup = NIH_MUST( nih_strdup(d, cgroup) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
/*
* This is one of the dbus callbacks.
* Caller requests chowning a cgroup @name in controller @cgroup to a
* particular @uid. The uid must be passed in as an scm_cred so the
* kernel translates it for us. @r must be root in its own user ns.
*
* If we are asked to chown /b to UID, then we will chown:
* /b itself, /b/tasks, and /b/procs. Any other files in /b will not be
* chown. UID can then create subdirs of /b, but not raise his limits.
*/
int cgmanager_chown (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup, int uid, int gid)
{
int fd = 0, ret;
struct ucred rcred, vcred;
socklen_t len;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("Chown: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
/*
* If chown is called from a different user namespace, then the
* results cannot make sense. Note that on an old enough kernel
* we cannot detect this. However, in that case the caller will
* not have privilege so will simply get a confusing -EPERM. In
* other words, we are doing this as a courtesy when possible
*/
if (!is_same_userns(rcred.pid)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"chown called from different user namespace");
return -1;
}
vcred.pid = getpid(); // cgmanager ignores this
vcred.uid = uid;
vcred.gid = gid;
ret = chown_main(controller, cgroup, rcred, rcred, vcred);
if (ret)
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
return ret;
}
void chmod_scm_complete(struct scm_sock_data *data)
{
char b = '0';
if (chmod_main(data->controller, data->cgroup, data->file,
data->pcred, data->rcred, data->mode) == 0)
b = '1';
if (write(data->fd, &b, 1) < 0)
nih_error("ChownScm: Error writing final result to client");
}
int cgmanager_chmod_scm (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup,
const char *file, int mode, int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_CHMOD);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
d->cgroup = NIH_MUST( nih_strdup(d, cgroup) );
d->mode = mode;
d->file = NIH_MUST( nih_strdup(d, file) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
/*
* This is one of the dbus callbacks. Caller requests chmoding a file @path in
* cgroup @name in controller @cgroup to a new @mode.
*/
int cgmanager_chmod (void *data, NihDBusMessage *message,
const char *controller, const char *cgroup,
const char *file, int mode)
{
int fd = 0, ret;
struct ucred rcred;
socklen_t len;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"message was null");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("Chown: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
ret = chmod_main(controller, cgroup, file, rcred, rcred, mode);
if (ret)
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
return ret;
}
void get_value_complete(struct scm_sock_data *data)
{
char *output = NULL;
int ret;
if (!get_value_main(data, data->controller, data->cgroup, data->key,
data->pcred, data->rcred, &output))
ret = write(data->fd, output, strlen(output)+1);
else
ret = write(data->fd, &data->rcred, 0); // kick the client
if (ret < 0)
nih_error("GetValueScm: Error writing final result to client");
}
int cgmanager_get_value_scm (void *data, NihDBusMessage *message,
char *controller, const char *req_cgroup,
const char *key, int sockfd)
{
struct scm_sock_data *d;
d = alloc_scm_sock_data(message, sockfd, REQ_TYPE_GET_VALUE);
if (!d)
return -1;
d->controller = NIH_MUST( nih_strdup(d, controller) );
d->cgroup = NIH_MUST( nih_strdup(d, req_cgroup) );
d->key = NIH_MUST( nih_strdup(d, key) );
if (!nih_io_reopen(NULL, sockfd, NIH_IO_MESSAGE,
(NihIoReader) sock_scm_reader,
(NihIoCloseHandler) scm_sock_close,
scm_sock_error_handler, d)) {
NihError *error = nih_error_steal ();
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Failed queue scm message: %s", error->message);
nih_free(error);
return -1;
}
if (!kick_fd_client(sockfd))
return -1;
return 0;
}
/*
* This is one of the dbus callbacks.
* Caller requests the value of a particular cgroup file.
* @controller is the controller, @req_cgroup the cgroup name, and @key the
* file being queried (i.e. memory.usage_in_bytes). @req_cgroup is relative
* to the caller's cgroup, unless it begins with '/' or '..'.
*
* XXX Should '/' be disallowed, only '..' allowed? Otherwise callers can't
* pretend to be the cgroup root which is annoying in itself
*/
int cgmanager_get_value (void *data, NihDBusMessage *message,
char *controller, const char *req_cgroup,
const char *key, char **value)
{
int fd = 0, ret;
struct ucred rcred;
socklen_t len;
if (message == NULL) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Message was NULL");
return -1;
}
if (!dbus_connection_get_socket(message->connection, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get client socket.");
return -1;
}
len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &rcred, &len) < 0) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get peer cred: %s",
strerror(errno));
return -1;
}
nih_info (_("GetValue: Client fd is: %d (pid=%d, uid=%u, gid=%u)"),
fd, rcred.pid, rcred.uid, rcred.gid);
ret = get_value_main(message, controller, req_cgroup, key, rcred, rcred, value);
if (ret)
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"invalid request");
return ret;
}
void set_value_complete(struct scm_sock_data *data)
{